Which step involves snipping the positive battery cable?

Mitigating electrical hazards is the correct step that involves snipping the positive battery cable. This action is crucial in a rescue situation involving a vehicle, as it helps to eliminate the risk of electrical shock and potential accidents associated with live electrical systems. By disconnecting the positive cable, rescuers ensure that there is no power running to the vehicle's electrical components, which could pose a danger to both the victims and rescuers, particularly when using hydraulic tools or during extrication efforts.

Additionally, this step is typically one of the first actions taken when responding to a vehicle incident, especially where there may be potential for fire or other electrical hazards. While other options might address important aspects of vehicle rescue operations—such as creating access to entrapped victims or ensuring the safety of personnel—they do not specifically pertain to the immediate act of removing power from the vehicle, which is essential for creating a safe working environment.